Ferromagnetism and superconductivity with possible $p+ip$ pairing symmetry in partially hydrogenated graphene

TL;DR

This paper predicts ferromagnetic and superconducting properties in partially hydrogenated graphene systems, suggesting they could host $p+ip$ pairing symmetry and serve as platforms for studying spintronics and triplet superconductivity.

Contribution

First-principles calculations reveal new ferromagnetic graphene derivatives with potential $p+ip$ superconductivity upon doping.

Findings

C$_{6}$H$_{1}$ is a ferromagnetic semimetal.

C$_{6}$H$_{5}$ is a ferromagnetic narrow-gap semiconductor.

Superconductivity with $p+ip$ pairing symmetry is predicted upon doping.

Abstract

By means of first-principles calculations, we predict two new types of partially hydrogenated graphene systems: C$_{6}$H$_{1}$ and C$_{6}$H$_{5}$, which are shown to be ferromagnetic (FM) semimetal and FM narrow-gap semiconductor, respectively. When properly doped, the Fermi surface of the two systems consists of an electron pocket or six hole patches in the first Brillouin zone with completely spin-polarized charge carries. If superconductivity exists in these systems, the stable pairing symmetries are shown to be $p+ip$ for electron doped case, and anisotropic $p+ip$ for hole doped case. The predicted systems may provide fascinating platforms for studying the novel properties of ferromagnetism and triplet-pairing superconductivity as well as two-dimensional spintronics.